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Linux

Useful Linux commands, with no particular order

Check which program is using a particular port

sudo lsof -i:port

Kill a particular PID

sudo kill -9 PID

Check the current folder size

du -hs .

Show filesystem information

df -h

SSH

Copying local keys to a remote server

ssh-copy-id user@server

Create a remote tunnel into localhost

ssh -L local-port:localhost:remote-port user@server -N

Note: AllowTcpForwarding and PermitOpen have to be enabled in /etc/ssh/sshd_config

Forward a local port to a remote host (like ngrok)

ssh -N -T -R local-port:localhost:remote-port user@server
  • -N Do not execute a remote command. This is useful for just forwarding ports.
  • -T Disable pseudo-terminal allocation.
  • -R Specifies that connections to the given TCP port or Unix socket on the remote (server) host are to be forwarded to the local side.

SCP

scp -r /folder/to/upload user@server:/destination/on/server

tar & untar

tar

tar -czvf file.tar.gz file/or/folder/to/tar/
  • -c create
  • -z gzip
  • -v verbose
  • -f filename

untar

tar -xvf file.tar.gz
  • -x extract
  • -v verbose
  • -f filename

gpg encrypt/decrypt

Encrypt

gpg -c --cipher-algo AES256 file/to/encrypt

You will be asked to enter a password

Decrypt

gpg file/to/decrypt

You will be asked to enter a password

Download an entire website using wget

wget --mirror --convert-links --page-requisites ----no-parent https://example-domain.com
linux.1615922914.txt.gz · Last modified: 2023/01/01 18:43 (external edit)